Microphone and magnetic switch assembly



United States Patent Inventors Robert C. Ramsey Niles; Gerrald K.Farrington, St. Joseph, Mich. Appl. No. 655,538 Filed July 24, 1967Patented Dec. 15, 1970 Assignee Electro-Voice, Incorporated Buchanan,Mich. a corporation of Indiana MICROPHONE AND MAGNETIC SWITCH ASSEMBLY 8Claims, 1 Drawing Fig.

Int. Cl. H04r l/00 Field of Search 179/167,

158,159,1SW,163,165,114R,l15R;240/10.63, 10.66, 10.6, 25

[56] References Cited UNITED STATES PATENTS 3,162,376 12/1964 SyiochiFuruya 240/1066 3,283,274 11/1966 A. De Falco 335/206 PrimaryExaminerl(athleen H. Claffy Assistant Examiner-Randall P. MyersAttorney-Burmeister and Kulie ABSTRACT: A magnetic switch assembly for amicrophone having a magnetic actuator slidable on a continuous wall ofthe microphone casing; said actuator being directly removable; and saidcasing being substantially unmodified while the actuator is stillreleasable and retainable with respect to the casing; and said magneticactuator cooperating with a reed switch positioned within the casing ona support provided on a foldable frame member adapted to hold othermicrophone circuit components.

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PATENTED am 51970 SHEET 3 OF 3 MICROPHONE AND MAGNETIC SWITCH ASSEMBLYThis invention relates to a microphone and magnetic switch assembly; andthe invention makes particular reference to an assembly in which anexterior actuator element may be simply removed, the microphone thenbeing actuated. The present invention also relates tomagneticallyactuated switches.

Microphones generally include a casing or housing with a microphonetransducer disposed within the, casing and exposed to the surroundingsound field and a connector accessi- I ble from the exterior of thecasing. Theconnector is adapted to be engaged to either a male orfemaleplug to provide electrical connections to the transducer. Variousswitch units and assemblies have been provided at some location on thecasing of conventional microphones to actuate and deactuate themicrophone. Such switches are generally permanently mounted and fixed inposition on the microphone casing. It is evident that suchpermanentlymounted switches require interlinking structures between theswitch actuation member and the circuit breaking elements of the switch.It is an object of the present invention to provide a switch whichutilizes a movable magnetic field between the switch actuation memberand the switch circuit breaking elements, and thus eliminates themechanical linkage of conventional switches.

Further, present switch assemblies are often objectionable insomeapplications such as microphones because the actuation member is visibleand exposed; It is an object of the present invention to provide aswitch assembly and a microphone utilizing such'a switch assembly, inwhich the ac tuating member may be removed.

A microphone constructed according to the present invention permits theuse of a substantially unmodified microphone casing, thus providing themicrophone with an attractive appearance and advantages in handling. Aperformer handles a microphone in various ways during a performance, andit is an advantage to the performer to eliminate a large switchstructure on the microphone casing. In addition to the advantageoushandling qualities, a microphone without a switch actuating member onthe exterior thereof has a pleasing appearance in that thecasingpresents a clean, substantially unmodified line.

Another object of the invention is to provide a switch assembly for amicrophone in which an exterior magnetic actuator element may be removedfrom the casing and mounted on the casing without the use of auxiliaryfasteners, such as screws, clips or the like. This object is served byproviding a magnetic actuator which may be essentially snapfitted ontothe casing and released from the casing by moving apart resilientmembers of the actuator element.v

Still another object of the invention is to provide a microphone andmagnetic switch assembly in which the microphone has a casing in whichone part of the switch assembly is displaced. and the switch circuitbreaking elements and other microphone circuit components areconveniently and compactly mounted on a frame disposed within theeasing; and in which a magnetic actuator is disposed exterior of thecasing for actuating and deactuating the microphone circuit withoutrequiring any interlinking structures between the actuating member andcircuit breaking elements of the magnetic switch.

Objects such as the foregoing are attained together with still otherobjects which will become apparent from considering the ensuringspecification, including drawings'wherein:

FIG. I is an exploded side view partly in section and with portionsseparated;

FIG. 2 is a longitudinal sectional view of the microphone of FIG. I;

FIG. 3A is an enlarged top plan view of a reed switch unit, which is acooperative part of the switch assembly of the microphone of FIGS. 1 and2;

FIG. 3B is an enlarged side elevational view of the reed switch insertof FIG. 3A; 1

FIG. 4 is a sectional view of the actuator member taken along line 4-4of FIG. I;

FIG. 5 is a bottom plan view of the actuator member of FIG.

FIG. 6 is a sectional view of the actuator member taken along line 6-6of FIG. 4;

FIG. 7 is a top plan view of a frame insert in unfolded condition beforeinsertion into the casing of the microphone;

FIG. 8 is a side elevational view of the frame insert of FIG.

FIG. 9 is a sectional view taken along line 9-9 of FIG. 8; FIG. 10 is asectional view taken along section 10-10 of FIG. 3;

FIG. 11 is a sectional view taken along line 11-11 of FIG. 8;

and

FIG. 12 is a sectional view taken along line 12-12 of FIG. 8. FIG. 1shows an exploded view of the microphone and magnetic switch assemblyconstructed according to the present invention, and it includes anelongated casing 14 having a continuous cylindrical wall 15. As will beapparent hereinafter, the casing must be constructed of magnetic. fluxpermeable material, i.e. not a ferromagnetic material. The microphone isshown with an enlarged or hell portion 16 at-one end to hold theelectroacoustical transducer in the form of a dynamic microphone head17. The enlarged end.l6 of the casing 14 receives the microphone head 17and is threaded at l8'as will be described hereinafter. The opposite-endof the casing 14 is shown as open with a continuous groove 20 in thecontinuous wall 15 of the elongated casing. The open end of the casingis also threaded, as indicated at 22, so that the threads 22 and groove20 may receive a threaded cord plug (not shown) which can engage thethreads and be seated in the continuous groove. An aperture 23 isdisposed adjacent to the open end of the casing 14 to receive a setscrew 23a to secure a connector insert within the casing 14.

The exterior surface of wall 15 of the casing 14 is provided with a pairof opposed narrow grooves or troughs 24 on opposite sides thereof. Thegrooves 24 are parallel to the axis of the wall 15 and are of relativelyshort length, and are adapted to releasably engage a magnetic actuatorshown generally as 26, which will be described in greater detail.

The microphone includes a protective screen 28 which is disposed in theopening of the bell shaped end of the casing to expose the transducer 17to the surrounding sound field. The screen 28 encompasses wind screen 30of open cellular foam plastic or the like. The microphone alsohas agrill 32 and a magnetic shield 34 which are mounted on a retainer head36 by a screw 39. The retainer head 36 is disposed within the bell end16 of the casing and engages the threads 18. The retainer head 36 alsosecures the dynamic microphone-head 17 within the casing 14. Themicrophone head or transducer 17 may be a dynamic type with a diaphragmmovable within a permanent magnetic field or another type of transducersuch as a balanced armature magnetic transducer or a piezoelectrictransducer or the like.

The microphone circuit components are shown to include conductors 40, 42connected to terminals 44, 46 of the head 17 and to a reed switch showngenerally at 48. Leads 50 and 52 extend from the reed switch to aterminal board 54, and leads 56 and 58 extend from the terminal board tothe primary winding of a transformer 60. Lead 62 is connected betweenthe transformer 60 and one terminal of the connector insert 64 forconnection to an appropriate plug cord. The magnetic reed switch 48 inshown in FIGS. 3A and 3B as including an envelope 66 which is evacuatedand encloses reeds 68 and 70 which are normally mechanically biasedapart. The envelope 66 is substantially rigid and may be a plastic,glass or an equivalent material readily penetratable by a magnetic flux.The reed 70 is substantially shorter than the reed 68, and the reed 68is constructed of resilient ferromagnetic material. The reed 68 may thusbe attracted by a magnetic force toward the reed 70, thus causing theconfronting ends of the reeds 68 and 70 to abut each other and formelectrical contact. Electrical contact between the reeds 68 and 70effectively shorts the primary winding of the transformer 60, and thusdeactuates the microphone. The reed switch 48 is thus one cooperativecomponent of the inagnetic switch assembly, and the normally spacedapart reeds are brought into contact under responsive influence of amagnetic flux.

The reed switch 48, transformer 60 and insert 64 are of electricallyinsulating material disposed within a foldable frame 71 having one part72 folded on another part 74. The frame 71 also carries a groundingstrap 75 which abuts the inside of the casing and is electricallyconnected to one end of the secondary winding of the transformer 60 by alead 57; a screw 77 securing the strap 75 to part 72 of the frame 71 andthereby holding the strap 75 in grounding engagement with the casing 14,as illustrated in FIG. 2. It is to'be noted that the casing 14 forms oneof the output terminals, and the shield of the connector cable shouldthus be connected to a female connector which threadedly engages thethreads 22 on the end of the casing 14, as is conventional.

The foldable frame 71 is best illustrated in the FIGS. 7, 8, 9, 11 and12 before folding or assembly andin FIGS. 2 and when folded and holdingthe various microphone circuit components. Part 72 is formed by arelatively thin part cylindrical throughout its entire length with aradius of curvature slightly less than the radius of curvature of theinner surface of the cylindrical wall of the casing 14. One end 76 ofpart 72 is open and the other end is closed by an end wall 78. The endwall 78 is a flat part circular disc and extends across the entire endof the part 72 and is integral therewith. Part 72 has a plurality ofcutouts 79a, 79b and 790 forming a relatively flat floor portion 80. Thefloor portion 80 terminates a short distance from the open end 76 toform a generally semicylindrical inner surface 84. The confronting endof the floor por 'tion 80 forms a flat shoulder disposed normal to theaxis of the part 72 and adjacent to the part cylindrical surface 84.Projecting portions 90 and 90a extend from opposite sides of the part 72in the region of the surface 88 and terminate at a distance from theopen end 76 of the part' 72, thus forming spaced right angle cutouts 92and 92a at the open end 76 of the part 72.

A counter-sunk aperture 96 is disposed centrally of the semicylindricalsurface 84 for accommodating a set screw 97, as is shown in FIG. 2.

The floor portion 80 in the illustrated embodiment is shown with an area98 adjacent to the cutout 79a which has no part cylindrical sidewalls.An elongated rectangular opening 100 in this area accommodates one therectangular sides of the trans formers 60, the protruding windings ofthe transformer abutting the surface of the floor portion. Thesemicylindrical surface 84 at the open end 76 of the part 72, of theframe 71 forms a socket which accommodates the connector insert 64between the shoulder 88 and the open end 76,

A portion 102 of the surface of the floor portion 80 on the side of thetransformer 60 opposite the open end 76 accommodates the terminal board54. This region has an aperture 104 extending through the floor portion80 through which lead 57 from the transformer 60 extends to make aconnection with the grounding strap 57, which is in contact with thecasing 14. Sockets or blind bores 106, 108 extend into the surface ofthe floor portion 80 flanking aperture 104 along the axial length of thefloor portion 80, and button projections 110 and 1100 protrude from thefloor portion 80 and flank blind bore 106 transversely of the elongationaxis of the floor portion 80. The terminal board 54 has protrudingbuttons 111 disposed within the blind bores 106 and 108 and recessesreceiving button projections 110 and 110a to retain the terminal boardin position. Similar blind bores 112, 114, button projections 116, 116a,and aperture 118 may be seen on the opposite side of the transformer forengaging a second terminal board when required.

Formed integrally with floor portion 80 is'a raised support 120, andthis support secures reed switch 48 on part 72. The support 120 is aresilient body having a leg 122 with a transverse axis parallel to thelongitudinal axis of the part and of substantially greater length thanthe thickness of the leg 122.

The support also has a pair of generally spaced legs 124 and 126 havingtransverse axes disposed on a common axis parallel to the transverseaxis of the leg 122. Leg 122 has a continuous ledge 128, as bestillustrated in FIG. 7 and 9, with a curved upper surface 129 contouredto the exterior surface of the reed switch 48. Also legs 124 and 126 areprovided with ends protruding toward the leg l22 and the ends have anundercut 130 formed thereon to conform to the contour of the reed switch48. The cylindrical envelope 66 of the reed switch 48 is wedged betweenthe legs 124 and 126 and the leg 122 securely held on the frame 71 inthis manner.

The cutouts 79a, 79b and 79c form a plurality of ribs, such as rib 132which extends below the floor portion 80 of the first part 72. The legs132 are continuations of the part cylindrical external surface of theframe 71 and contact the interior wall of the microphone casing 14, asillustrated in FIG. 2.

Frame member part 74 is integral with part 72 has a planar portion 134which is connected mechanically to end wall 78 of part 72 through ahinge 135. The hinge 135 is formed by a flat strip 135a which extendsbetween parts 72 and 74, and is provided with a transverse groove sothat 74 may be foldable on top of part 72, as shown in FIG. 2. Since thehinge 135 must be of resilient material, the frame 71 is preferably ofplastic material, such as polyproplene, which also satisfies therequirement of low electrical conductivity.

Planar portion 134 has a cutout 136 which is adapted to allow the spacedresilient legs 122, .124 and 126 to pass therethrough when the part 74is folded down on part 72. The cutout 136 has edges 136a and 13612disposed parallel to the longitudinal axis of the part 74 whichengagethe outer surfaces of the legs 122, 124 and 126. As best shown inFIGS. 7 and 9, the legs 122, 124 and 126 present outer surfaces whichtaper outwardly from the ends of the legs to the floor portion 70, sothat the edges 136a and l36b wedge against the outwardly facing surfacesof the legs 124, 126 and 122, respec-.

tively, thereby assuring a secure mounting for the reed switch 48Adjoining the planar portion 134 of part 74 is a part cylindricalportion 138 with the same radius of curvature as that of part 72. Thepart cylindrical portion 138 also has a part cylindrical inner surface139 which extends between two end walls 140 and 142 disposed normal tothe longitudinal axis of part 74 and extending thereacross. The planarportion 134 of part 74 is disposed in the plane of part- 74 nearest theaxis of revolution of the surface 138, so that when part 74 is folded ontop of part 72 as indicated in FIG. 2, a maximum volume is disposedbetween the surface 139 and part 72. The contour of the frame 71 formedby part 72 and 74 conforms to the cylindrical inner surface of thecasing 14 of the microphone when the frame member is folded, thuspermitting the folded frame to be inserted within the casing 14.

Part 74 has an open end 144 defined by a part cylindrical surface 146.curved protruding stubs 148, 148a extend from the open end of part 72and mate with cutouts 92 and 92a of part 72 when the parts are foldedtogether. A semicircular groove 150 in the exterior surface 138 in aplane normal to the longitudinal axis of part 74 is aligned with agroove 139 in part 72 to form a seat for circular spring 152 (FIG. 1) tohold the folded parts 72 and 74 together prior to insertion into thecasing 14, thereby facilitating this operation.

The actuator element 26 is releasably mounted on the cylindrical wall15.of the microphone casing 14. As shown in FIGS. 4, 5 and 6, actuatorelement 26 is in the form of a yoke and includes a body 154 with a pairof spaced legs 156 and 158 extending therefrom and integral therewith.The inside surface of the legs 156 and 158 and the body 154 is acontinuous generally semicylindrical surface 160 with a diameterapproximately that of the cylindrical wall 15 of the casing 14, so thatthe inner surface 160 of the actuator element conforms to the exteriorsurface of the cylindrical wall 15 of the microphone casing 14. Thelegs156 and 158 have lugs 162 and 164, respectively, which protrudetoward one another from the surface 160 to slidably engage the groovesor channels on opposite sides of the microphone casing, one of which isshown at 24 in FIG. 1. These lugs serve to slidably mount the actuatorelement 26 on the casing 14 and to limit the travel of the actuatorelement between the actuate and deactuate positions, as will be morefully described hereinafter.

The top of the actuating element 26 has a flat, roughened surface 166 toprovide traction for the finger or thumb of the operator which willslide the actuator element along the microphone casing 14. The roughenedsurface is shown as comprising a plurality of alternating ridges andvalleys. The sidewalls 168 and 170 of the actuator are tapered from topto bottom to provide thicker regions adjacent to the surface 166 andthus limit bending of the legs 156 and 158 in the region adjacent to thesurface 166. Hence, the body 154 and legs 156 and 158 of the actuatingelement 26 may be constructed of resilient plastic, such as polysulfaneand the outward bending of the legs 156 and 158 will be sufficientlyrestricted that the actuator element 26 will form a good snap fit on thecasing 14. The front and back sides of the resilient body have surfaces172 and 174 which taper outwardly from the top roughened surface 166 toprovide a longer surface for engagement by the operator. Approximatelyat the junction of the body 154 and the legs 156, 158, the front andback sides of the actuating element 26 are undercut as at 176 and 178;and the front and back sides then continue as straight edge surfaces asshown at 180 and 182.

The surface of the body 154 confronting the wall of the casing 14 isprovided with a generally cruciform socket 183 which has tapered sides184, 186, a tapered end wall 188, and a straight end wall 190 so that apermanent magnet 192 of matching configuration is securely wedged intothe socket 183 and secured therein as by cement.

The socket has extensions 196, 196a, 1961; and 1960 which impart acruciform configuration to the socket. This permits a tool to be usedfor seating the permanent magnet 192 in the socket or for removing thepermanent magnet therefrom. The magnet 192 is magnetically polarizedalong an axis parallel to the longitudinal axis of the casing 14 inorder impress a maximum of flux on the reed 68 of the reed switch 48.

in use, the resilient legs 156, 158 of the yokelike actuator element 26are urged apart so the actuator element may be mounted on the microphonecasing 14 in such a way that interlocking lugs or guides 1.62, 164 areseated in the grooves 24, one in the casing 14. When the actuatorelement 26 is translated towards the connector end of the casing 14 themagnetic flux from the magnet 192 is aligned with the reed 68 of thereed switch 48 thus increasing the magnetic attraction between themagnet 192 and the reed 68, and causing the reed 68 to abut the reed 70to deactuate the microphone. The reeds 68 and 70 will remain in abutmentand the microphone deactuated as long as the magnet remains in thisposition. This position of the actuator element 26 is determined bysliding the actuator element backwardly until the lugs 162 and 164 arestopped against the ends of the grooves 24. The microphone may beactuated in either of two ways. First, the resilient legs 156. 158 canbe urged apart and the actuator element 26 removed from the casing 14,whereupon the microphone may be operated without the actuator element.Second, the actuator element 26 may be translated toward the bell 16 ofthe casing 14. Either of these ways displaces the magnet from the reed68 and permits the resiliency of the reed 68 to pivot the reed 68 fromthe reed 70 and open the reed switch 48. The microphone is renderedoperative by sliding the actuator element 26 forwardly until the lugs162 and 164 abut the ends of the grooves 24 towards the enlarged portion14 of the casing.

The use of the frame insert member 71 to hold the reed switch 48 of thetransfonner 60, terminal board 54 and connector insert 64 permits theseelements to be assembled and electrically interconnected exterior of themicrophone casing 14, and inserted into the casing 14 as a unit.

When the frame member 71 is folded upon itself, these components aresecurely held in position without requiring each element to beseparately mounted. The folded frame member 71 with the assembledcomponents is secured within the casing of the microphone by a singlescrew 198 extending through an aperture 200 in the casing 14 adjacent tothe insert 64, as illustrated in FIG. 2.

Such a frame 71 is preferably integrally molded from a slightlyresilient plastic. A suitable plastic for the frame 71 is polypropylene.The same or equivalent plastic material may also be used to mold theactuator element 26.

The foregoing specification describes a microphone switch of theshorting or normally open type, i.e., a switch which is open duringnormal operation. Those skilled in the art will also recognize that theinvention may be practiced with a series connected switch which isclosed during normal operation.

The invention may now be practiced in the various ways which will occurto practitioners, and all such practice is intended to be a part of thepresent invention provided it comes within the terms of the followingclaims as given further meaning by the language of the precedingspecification We claim:

1. A microphone comprising, in combination: a casing constructed ofnonmagnetic material having an opening to the surrounding sound field,an acoustoelectrical transducer mounted within the casing incommunication with the sound field for generating electrical signalsresponsive to said sound field, and an electrical switch electricallyconnected to the electroacoustical transducer for actuating anddeactuating the microphone, wherein the switch comprises a magnetic reedswitch having a first and a second operable condition mounted in a fixedposition within the casing, said switch having one reed pivotallymounted with respect to the other reed and being in one of said operableconditions when said reeds are in abutment and the other of saidoperable conditions when the reeds are spaced, said pivotally mountedreed being constructed of ferromagnetic material and having a permanentset relative to the other reed to establish one of said first and secondoperable conditions as a normal condition, an actuator mounted on theoutside of the casing, said actuator being movable on said casing andhaving a permanent magnet therein adjacent to the casing, and a foldableframe member within the casing, said frame member having a first part, asecond part, and hinge means connecting said parts, said parts beingfoldable from a linear extension to a matching position of said parts,and said parts in the folded position adapted to receive and holdvarious elements of the microphone circuit, including means to hold thereed switch in a fixed position within the casing, magnetic flux fromsaid permanent magnet penetrating the pivotal reed when said actuator isdisposed adjacent to said reed switch to induce said reed to move fromits permanent set to establish the other operable condition of theswitch, and the magnetic flux not affecting the pivotal reed when saidactuator is remote from the switch.

2. A microphone comprising the combination of claim 1 wherein the reedswitch includes a pair of reeds biased out of contact and disposedwithin a substantially rigid, elongated envelope, and wherein said firstpart includes a support member for said envelope, said support memberincluding spaced resilient members to receive and release the envelopeby a snap fit.

3. A microphone comprising the combination of claim 2 wherein the secondpart of the foldable frame member has a cutout adapted to be positionedabove the support member when the frame member is folded, said cutoutpermitting the spaced resilient legs of the support member, and theenvelope positioned therebetween, to pass through the cutout in saidsecond part.

4. A microphone comprising the combination of claim 3 wherein the firstand second parts have curved sidewalls when in the unfolded linearextension, a planar end wall radially in tersects the curved walls atadjoining ends of said parts, and hinge means joining said second partto the said first part at the top of an end wall, said second. arthaving a substantially .1 V planar portion connected to said hingemeans, said cutout being disposed in said second part planar portion.

5. A microphone comprising the combination of claim 3 wherein:

said first part has an open end with a part cylindrical contour, aconnector insert disposed in said open end;

a planar area on said first part adapted to receive a transformer; I

a curved wall area in said first part having a floor portion and spacedcurved walls, said support member rising from said floor portion abovesaid curved wall area;

a verticalend wall intersecting an end of said curved wall area, saidhinge means joining said second part to said first part at a junction atthe top of said end wall;

a planar area in said second part connected to said hinge means,a-cutout in said second part planar area through which the resilientlegs of the support member may pass when the second part is folded ontofirst part;

an open end of said second part, region having a part cylindricalconfiguration at said second part open end, said part cylindrical regionat said open ends of said first and second parts forming a cylindricalregion of said connector insert when the parts are folded; and

a curved wall area on said second part which cooperates with said firstpart curved wall area to form substantially circular portions when saidparts are folded together.

6. A microphone comprising the combination of claim 5 wherein asubstantial portion of the axial length of said first part is spacedfrom the wall of the casing when positioned within said casing, and saidfirst part further including a plurality of legs spaced along the axiallength to support the folded frame insert within said casing.

7. A microphone comprising the combination of claim 5 wherein whichfurther includes means to fasten the part cylindrically adjoining foldedends of said first and second parts.

8. A microphone comprising, in combination, an elongated casingconstructed of nonmagnetic material having an opening to the surroundingsound field, an acoustoelectrical transducer mounted within the casingin communication with the sound field for generating electrical signalsresponsive to said sound field, and an electrical switch electricallyconnected to the electroacoustical transducer for actuating anddeactuating the microphone, wherein the switch comprises a magnetic reedswitch having a first and a second operable condition mounted in a fixedposition within the casing, said switch having one reed pivotallymounted with respect to the other reed and being in one of said operableconditions when said reeds are in abutment and the other of saidoperable conditions when the reeds are spaced, said pivotally mountedreed being constructed of ferromagnetic material "and having a permanentset relative to the other reed to establish one of said first and secondoperable conditions as a normal condition, an actuator mounted on theoutside of the casing, said actuator being movable on said casing andhaving a permanent magnet therein adjacent to the casing, and a pair ofspaced resilient legs which ride against the exterior surface of thecasing, the actuator being removable from the outside of the casing bypulling the legs of the actuator element away from the outside of thecasing, the actuator further including interlocking guide projections onthe inside surfaces of the spaced resilient legs, said guide projectionsbeing opposed to one another, opposite sides of the casing wall havingelongated slide grooves, said projections being adapted to ride theslide grooves when the actuator is mounted on the casing, whereby. theopposed terminating portions of the slide grooves define the extent ofthe movement of the actuator to its respective positions for moving thereeds in and out of contact with each other, magnetic flux from saidpermanent magnet penetrating the pivotal reed when said actuator isdisposed adjacent to said reed switch to induce said reed to move fromits permanent set to establish the other operable condition of theswitch, and the magnetic flux not affecting the pivotal reed when saidactuator is remote from the switch.

zygg UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,548,119 Dated December 15, 1970 I mmfl Robert C. Ramsey & Gerrald K.Farrington It is certified that error appears in the above-identifiedpatent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 54 after "is", change "disp1aced" to --di'sposed.

Column 1, line 64 after "the", change "ensuring" to -ensuing-.

Column 3, line 74 after "part", insert -72--.

Column 6, line "75 after"second", change "art" to -part--.

Column 7, line 21 after "ends", change "of" to --for--.

Signed and sealed this 8th day of June 1971.

(SEAL) Attest:

EDWARD M.FIETCHER, JR. WILLIAM E. SCHUYLER, JR. Attesting OfficerCommissioner of Patents

